Good question. The zip ties allow me to rotate the Telrad around to the inside of the OTA so it is out of harm's way when I move the scope around as a whole unit. You can also slide the Telrad up and down if required for balance or a different viewing position, although up the top seems best.
Because the pole it is attached to is along the optical axis it does not get out of alignment when doing this.
I also use the Telrad dewshield with the mirror built in so I can align objects whilst viewing at right angles too.